81477113 has 4 divisors (see below), whose sum is σ = 81609360. Its totient is φ = 81344868.

The previous prime is 81477103. The next prime is 81477133. The reversal of 81477113 is 31177418.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31177418 = 2 ⋅15588709.

It is a cyclic number.

It is not a de Polignac number, because 81477113 - 2⁶ = 81477049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81477113.

It is not an unprimeable number, because it can be changed into a prime (81477103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65195 + ... + 66432.

It is an arithmetic number, because the mean of its divisors is an integer number (20402340).

Almost surely, 2^81477113 is an apocalyptic number.

It is an amenable number.

81477113 is a deficient number, since it is larger than the sum of its proper divisors (132247).

81477113 is a wasteful number, since it uses less digits than its factorization.

81477113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132246.

The product of its digits is 4704, while the sum is 32.

The square root of 81477113 is about 9026.4673599366. The cubic root of 81477113 is about 433.5227344958.

The spelling of 81477113 in words is "eighty-one million, four hundred seventy-seven thousand, one hundred thirteen".